The 41-year-old actor was seen in New York at a restaurant with friends and although he was without his fiancee, he seemed to be enjoying and looked very happy.
"Justin was laughing so loud the whole restaurant could hear him. (They were) obviously having a great time," people.com quoted a source as saying. "Justin looked like the happiest guy in the world," the source adds," the source added.
The couple announced the engagement news Aug 12.